Decision fatigue from trivial matters
Every day we make approximately 35,000 conscious decisions. Some of them concern truly important things – careers, relationships, health. Most of them, however, are complete trivialities: what to have for breakfast, which t-shirt to put on, whether to answer that email right away or in an hour. And it is precisely these small decisions, which seem harmless, that can literally exhaust a person by evening.
The phenomenon that psychologists refer to as decision fatigue is not an excuse or a trendy term for laziness. It is a well-documented psychological phenomenon that affects the quality of our decisions throughout the day and has a direct impact on our health, productivity, and overall wellbeing. The more decisions we are forced to make, the worse our ability to decide becomes – and ironically, the smallest and seemingly most trivial choices are the ones that tire us out the most.
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What happens in the brain when we make too many decisions
The brain is an extremely energy-intensive organ. Although it makes up only about 2% of body weight, it consumes roughly 20% of all the energy the body produces. Every decision – regardless of how small it seems – requires activation of the prefrontal cortex, the area of the brain responsible for planning, reasoning, and self-control. This area has limited capacity, however. It works somewhat like a muscle: the more we strain it, the faster it tires.
Groundbreaking research from 2011, conducted by psychologist Roy Baumeister and his colleagues, showed that Israeli judges decided on parole significantly more favorably in the morning or immediately after a meal break, while throughout the rest of the day their decisions gradually drifted toward denial – that is, toward the default, safer state. It had nothing to do with how serious the cases were. It was related exclusively to how many decisions the judges had already made that day. The conclusion was clear: a tired brain chooses the easiest path, which is either to maintain the status quo or to reach for the first available option.
This mechanism works for each of us. When you easily choose a healthy breakfast in the morning but end up with a bag of crisps in front of the television in the evening, it is not a failure of willpower. It is a natural response of an exhausted brain that no longer has the energy to consider alternatives.
The modern world makes the situation significantly worse. Just thirty years ago, choosing a shampoo in a shop was relatively straightforward – there were five, maybe ten varieties available. Today, supermarkets offer dozens of variants for every hair type, with different ingredients, in different sizes and price ranges. The same applies to yoghurts, insurance policies, streaming services, or mobile phone plans. Psychologist Barry Schwartz described this paradox in his book The Paradox of Choice: more options do not mean greater freedom, but a greater burden on the mind and, paradoxically, lower satisfaction with the final choice.
Small things as the greatest enemy of focus
You might wonder why it matters that we get tired from making decisions about trivial things. After all, what does it matter if we choose the right shampoo? The problem is that decision fatigue over small matters spills its energy toll into the areas that matter most to us. A manager who spent the morning sorting out where the company party will be held and what catering it will have has significantly less mental capacity in the afternoon for strategic decisions that will genuinely affect how the company runs. A parent who deals every morning with what to cook for lunch and what to buy at the shop may have far less patience in the evening for a conversation with their child about problems at school.
Everyday experience confirms this very convincingly. Imagine Martina, a project manager at a medium-sized company. Every day begins with her dealing with dozens of minor organisational questions – when to schedule a meeting, who to reply to first, what to get for lunch from the restaurant across the street, whether to buy coffee or tea. By noon she paradoxically feels more exhausted than after a demanding client presentation. In the evening she cannot even decide what film to watch and ends up scrolling aimlessly without choosing anything. Martina's story is not an exception – it is a reality that most people in demanding jobs know well.
The solution that a surprising number of successful people have arrived at is, at first glance, paradoxical: deliberately limiting the number of decisions we make each day. The most famous example is Steve Jobs, who wore the same black turtleneck and jeans every day. Barack Obama admitted to a similar strategy, having only two suit colours prepared for him so he would not have to think about what to wear. This was not laziness or a lack of imagination – it was a conscious protection of mental capacity for things that truly matter.
As the writer and philosopher William James wrote: "The art of being wise is the art of knowing what to overlook." This idea is unexpectedly relevant in the context of decision fatigue.
How to simplify everyday decision-making
The good news is that decision fatigue can be actively managed. The goal is not to give up freedom of choice, but to establish systems and habits that automate or eliminate minor decisions – thereby freeing up mental space for what truly matters.
One of the most effective strategies is routine. Fixed morning rituals – the same wake-up time, clothes prepared in advance, always the same or similar breakfast – reduce the number of decisions at a time when the brain is only just getting started. Research shows that even a short meditation or physical activity in the morning helps the prefrontal cortex start up more efficiently, which improves the quality of decision-making for the rest of the day.
Another approach is the principle of the so-called capsule wardrobe, which has gained great popularity in recent years, particularly in the context of sustainable living. Instead of a wardrobe crammed with dozens of items of clothing from which it is difficult to choose every morning, a capsule wardrobe contains only a limited number of quality, mutually combinable pieces. The selection is therefore quick and painless – and as a bonus, impulsive shopping is also reduced, which is itself a consequence of decision fatigue. A tired brain is more susceptible to tempting offers and discounts, because it lacks the energy to rationally assess whether it actually needs a given item.
A similar logic can be applied in the kitchen as well. Planning meals for the entire week in advance – so-called meal planning – eliminates the daily question of "what shall I cook today" and also reduces food waste. A study published in the International Journal of Behavioral Nutrition and Physical Activity showed that people who plan meals in advance eat more healthily and spend less money, while experiencing less stress associated with daily decisions about food.
It is also useful to think about the environment in which we make decisions. A cluttered flat full of things that have no designated place constantly generates small decisions: where to put this, what to do with that, whether I still need it. A minimally organised space, where every item has a clearly defined purpose and place, significantly reduces this invisible cognitive load. It is no coincidence that interest in ecological and minimalist homes has been growing in recent years – people are intuitively seeking ways to simplify their daily functioning and focus energy on what brings them genuine value.
Technology is a double-edged sword in this regard. On one hand, it can automate routine decision-making – from regular orders of staple groceries to smart calendar planning. On the other hand, it adds an enormous number of new decisions: which notifications to read, which messages to respond to, what to watch, what to like. Consciously setting boundaries around technology use – for example, turning off non-essential notifications or designating specific time blocks for emails – can significantly reduce the daily decision-making burden.
Sleep quality and nutrition also play a considerable role. A brain tired from lack of sleep or a hungry brain suffers from decision fatigue far more quickly. Neuroscience research repeatedly confirms that after a sleepless night the quality of decision-making deteriorates dramatically – and yet the person in question is usually completely unaware of it. Investing in a healthy sleep routine and a balanced diet rich in nutrients is not merely a matter of physical health; it directly affects how well we are able to function in everyday life.
The key is to recognise that simplifying everyday decision-making is not a capitulation, but a strategy. When we consciously create systems, routines, and environments that reduce the number of unnecessary choices, we do not lose freedom – on the contrary, we gain it where we truly need it. The energy saved by not deciding what to wear or what to cook for dinner can be used for creative thinking, meaningful relationships, or the courage to make a truly important life decision that we may have been putting off for far too long.
Decision fatigue over trivial matters is a silent thief of mental energy. But once we recognise it, we have the tools to stop it.
